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    "#### 图像的基本知识：\n",
    "##### 像素\n",
    "##### RGB\n",
    "##### 颜色深度 8bit 0-255\n",
    "##### w h 640 *480\n",
    "##### 1.14M  720*547*3*8 bit /8 (B) = 1.14M  (长*宽*3种颜色*每种颜色深度表示占8位)\n",
    "##### RGB alpha 图片的透明度信息\n",
    "##### 颜色深度格式除RGB外，还有bgr \n",
    "##### bgr  blue green read"
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